Answer:
tributary
Explanation:
A tributary is a river that runs into another river.
mention two morphological differences between pteridophyte
and spermatophyte
Answer:
The main difference between these two classes is that: Pteridophytes are vascular plants but they do not produce flowers and seeds which mean their source of reproduction is unknown or hidden. Examples are ferns, horsetails and lycophytes. On the contrary, Spermatophytes as the name indicates, are seed bearing plants.
Explanation:
Answer:
THE DIFFERENCE is that spermatophyte is (botany) any plant that bears seeds rather than spores while pteridophyte is any plant of the division pteridophyta, of simple vascular plants that reproduce via spores rather than seeds and that alternate generations of diploid (sporophyte) and haploid (gametophyte or prothallus) forms
Explanation:
Solid, gas, and liquid Which states of matter have a set shape? Explain why this is, based on the animation you observe for the different states of matter. Which states of matter have a set volume? Explain this based on the animations you observe for the different states of matter?
Answer:Solid has a set shape. Solid can move but gas and liquid is more flexible than solid. Solid has a fixed volume while liquid and gas takes the volume of its container. Solid stays in one place while gas and liquid is flexible.
Explanation:
Predict which one of the following organisms will have the highest percentage of unsaturated fatty acid chains in their membranes: Group of answer choices thermophilic bacteria desert iguana humans antarctic fish
Answer:
Humans
Explanation:
Humans are bigger than most beings and some people are extremely obese.
The organisms that have the highest percentage of unsaturated fatty acid chains in their membranes are ANTARCTIC FISH.
Unsaturated fatty acid chains have one or more double bonds, while saturated fatty acid chains do not contain any double bonds.When the temperature decreases, the composition of the phospholipids bilayer membrane becomes more unsaturated to be able to maintain different properties such as homeoviscosity.In consequence, membrane lipids exhibit the highest percentage of unsaturated fatty acid chains during cold acclimation.In conclusion, the organisms that have the highest percentage of unsaturated fatty acid chains in their membranes are ANTARCTIC FISH.
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Different protists use cilia, _______, or pseudopodia to move.
Answer:
Different protists use cilia, flagella , or pseudopodia to move.
How was the present-day theory of evolution developed?
Answer:
The theory of evolution by natural selection, first formulated in Darwin's book "On the Origin of Species" in 1859, is the process by which organisms change over time as a result of changes in heritable physical or behavioral traits.
Explanation:
Brian's eighth grade biology class is conducting a scientific investigation to find out what types of rock the school is built on. The class goes out to collect rocks from an exposure at the edge of the school property. Which scientific process is the class involved in when they do this
Answer:
Gathering evidence.
Explanation:
Scientific evidence refers to the information obtained by research or observation.t This is the root of the scientific method because it's how an investigator evaluates different ideas, theories, or hypotheses. The mechanism of science involves explaining the phenomena we see in the world that match the data one has collected for the purpose. If one's theory doesn't match the evidence, then it needs to be revised. Therefore collecting evidence is a significant part of scientific investigation.
Hitchhiker's thumb is inherited via two recessive alleles and causes a hyperextensibility of the thumb. The dominant allele causes a straight thumb phenotype. Predict the phenotypic and genotypic ratios from the following cross.
One parent with Hitchhiker's thumb crossed with a Straight thumbed individual who had a parent with Hitchhiker's thumb.
a. Phenotypic and Genotypic 1:1
b. Phenotypic 2:1 and Genotypic 1:1
c. Phenotypic 1:1 and Genotypic 2:1
d. Phenotypic and Genotypic 3:1
Answer:
a. Phenotypic and Genotypic 1:1
Explanation:
Two recessive alleles are required in order to be phenotypically affected for Hitchhiker's thumb. Hence, the genotype of the parent with Hitchhiker's thumb would be homozygous recessive.
Assuming the trait to be represented by the allele h, the genotype of the parent with Hitchhiker's thumb would be hh while the genotype of an individual with straight thumb who had a parent with Hitchhiker's thumb would be heterozygous, Hh.
Crossing the two individuals.
hh x Hh
Progeny: Hh hh Hh hh
Hh - Straight thumb
hh - Hitchhiker's thumb
Hence, the genotypic ratio is 1:1 while the phenotypic ratio is also 1:1.
The correct option is a.
Give an example of a biological mutagen
Answer:
An example of a biological mutagen is Bacteriophage MU.
Other examples of mutagen are radioactive substances, ultraviolet radiation and certain chemicals
The only part of the earths inner structure that is a liquid is the
Answer:
The answer would be the outer core
Explanation:
A 45 year old man had coronary artery stents placed 2 days ago. Today, he is in severe distress and reporting crushing chest discomfort.
Answer:
idk man
Explanation:
Pigment of chicken feathers is regulated by two genes, the gene for feather pigment C, and a gene that inhibits pigment production, I. A mother chicken, who is heterozygous for gene C, and heterozygous for gene I, is crossed with a father chicken, who is homozygous recessive for the pigment gene, and heterozygous for gene.
1) What are the potential haplotypes of the gametes produced by the mother for these two genes?
2) What are the potential haplotypes of the gametes produced by the father for these two gametes?
3) What is the probability of one of the offspring of these two chickens having pigmented feathers?
4) In a population of 100 chickens, produced from the same parents, how many chickens would you expect to have white feathers?
Answer:
(1) CI Ci cI ci
(2) CI Ci
(3) 25
(4) 75
Explanation:
Mother is in this case is heterozygous for C & I, genotype of mother would be : CcIi
Father is on other hand is homozygous for C (dominant) and heterozygous for I, genotype : CCIi
1. Gametes produced by the mother will be:
CI Ci cI ci by the combinantion of C, I, c, and i alelles present in mothers genotype.
2. Gametes produced by the father :
CI Ci by the combinantion of alleles present i genotype of father CCIi
3. probability of one of the offspring of these two chickens having pigmented feathers:
2/8 × 100 = 25% ( punnet is attached)
4. chicken with white feather in population of 100 chickens:
probability of being white × 100
probability of being white : 1 - 2/8
thus, (1-2/8) × 100 = 6/8 × 100
= 75%
Many traits (phenotypes), like eye color, are controlled by multiple genes. If eye color were controlled by the number of genes indicated below, how many possible genotype combinations would there be in the following scenarios?
a. 5 Genes:
b. 10 Genes:
c. 20 Genes:
Answer:
Explanation:
If there are 5 genes, let us assume that they are in the alternative forms with 2 possible gets for each five... So we have
2 possible gametes for each five = 2 to the power of 5 = 32 gametes
Then genotypes = 3 to the power of 5 = 243
The same also for 10 genes
2 possible gametes for each 10 = 2 to the power of 10 = 1024 gametes
Then genotypes = 3 to the power of 10 = 59,049
The same also for 20 genes
2 possible gametes for each 20 = 2 to the power of 20= 1,048,576
Them genotypes = 3 to the power of 20 = 3,486,784,401
Many traits (phenotypes), like eye color, are controlled by multiple genes. In the following scenario, the number of genes are:
a. 5 Genes: 243 genes
b. 10 Genes: 59,049 genes
c. 20 Genes: 3,486,784,401 genes
What are genes?Genes are small hereditary materials bound in tiny beads like fashion and make a chromosome.
Now, the number of genes in the given scenario is:
a. 5 Genes: If there are 5 genes, let us assume that they are in the alternative forms, with 2 possible gets for each five.
So, 2 possible gametes for each five = 2 to the power of 5 = 32 gametes
The genotypes combinations = 3 to the power of 5 = 243
b. 10 Genes: 2 possible gametes for each 10 = 2 to the power of 10 = 1024 gametes
The genotypes combinations = 3 to the power of 10 = 59,049
c. 20 Genes: 2 possible gametes for each 20 = 2 to the power of 20 = 1,048,576
The genotypes combinations = 3 to the power of 20 = 3,486,784,401
Therefore, the number of genes is:
a. 5 Genes: 243 genes
b. 10 Genes: 59,049 genes
c. 20 Genes: 3,486,784,401 genes
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The following are examples of characteristics that can be inherited except
(a)intelligence (b) complexion (C) type of blood (d) shape of head (e) sex of the child
Answer:
sex of the child
Explanation:
After a polypeptide chain has been synthesized, certain amino acids in the peptide may become modified. For each modified amino acid, identify the standard amino acid from which it is derived. Enter the unabbreviated name of the standard amino acid.
Answer:
Lysine
Explanation:
Lysine is a unabbreviated name of amino acid. It is used in biosynthesis of proteins. It contains [tex]\alpha[/tex]-amino group and [tex]\alpha[/tex]-carboxylic acid group which has formula is C6H14N2O2. Lysine is also considered as building block of amino acid. It is used for treating cold sores and can be applied directly to the skin.
HHH
НОН
HHH
но-н
нЩн
нон
HHH
HHH
HHH
List the number of each atom in the formulas above:
Н
О
0
Answer:
According to the diagram above, there are 8 Hydrogen, 1 Oxygen and 3 Carbon .
Answer:
3 carbons
Explanation:
Consider an experiment where you digest a DNA molecule with restriction enzyme BclI. You resolve the products of the digest by gel electrophoresis. Then, you cut out each of the resulting two bands from the gel and sequence the DNA. The sequencing results return two DNA segments.
Segment 1
5′ CCGCGGT 3′
3′ GGCGCCACTAG 5′
Segment 2
5′ GATCAGGATCC 3′
3′ TCCTAGG 5′
1. What is the sequence of the BclI recognition site?
2. What type of ends do the products have?
Answer:
This BclI restriction enzyme recognizes and cut at T / CTAG nucleotide sequences.
Explanation:
5′ CCGCGGT 3′
3′ GGCGCCACTAG 5′
Segment 2
5′ GATCAGGATCC 3′
3′ TCCTAGG 5′
The BclI enzyme generates sticky ends, it means that the enzyme recognises and cuts nucleotide sequences without complementary bases, which also have weak hydrogen bonds. The sticky ends are then generated when an enzyme produces unpaired nucleotide ends. Nonetheless, restriction enzymes generally produce blunt ends, i.e., both strands cut at the same site.
The fruit fly Drosophila melanogaster is an important model system for studying inheritance in animals and genetic control of animal development, including humans. Evaluate Drosophila as a model system for human biology. What are their strengths and weaknesses as a model system? g
Answer:
The correct answer is "strengths: inexpensive, easy to culture, short life cycle, large number of offspring; weaknesses: invertebrate model, some diseases such as immunological cannot be modelled, anatomical features are very different from humans"
Explanation:
The fruit fly Drosophila melanogaster is one of the most used animal model for genetic and biomedical studies. There are many advantages of using Drosophila as model, including that it is very inexpensive to handle, it is easy to culture, it has a short life cycle allowing to observe the changes in phenotype very quickly and its large number of offspring allows to include several repetitions per trait in a study. However, there are some weaknesses of using Drosophila to study human biology. First, obviously the fruit fly is very different from humans, it is an invertebrate and its anatomical features are very different, which makes impossible to model some disorders such as immunological diseases.
Cells must maintain an appropriate level of fluidity across their membranes. Hot temperatures lead to greater membrane fluidity. What might you then expect to find regarding the membrane composition of bacteria from very hot environments
Answer:
Thermophilic bacterial are rich in large quantity of thermophilic lipids in the cell membranes. This components made the membrane to be impermeable at high temperature, and therefore a good adaptation for the hot environment.
At high temperature,proton permeability increase, sodium permeability also increases but to a ;lesser extent, but Lipid is independent of this temperature rise.
Hence, these organisms rely on the less permeable Na+ for the maintenance of high sodium motive force.it is the energy derived from this that the cell membrane needs to maintain stability, coupe with the lipid content.
Explanation:
. If Haily is analyzing samples of chromosomes under a microscope which feature would help her categorize the different samples? A. Genetic makeup B. Arm length C. Shape D. Centromere placement E. None of the above
Answer:
B. Arm length
C. Shape
D. Centromere placement
Explanation:
Cytogenetics is a discipline that study the structure and number of chromosomes including their morphology, position of the centromere, arm length, staining bands, etc. These features can be observed by microscope and enable us to identify different genome rearrangements (i.e., translocations, deletions, centric fusion, chromosome duplications, etc.) by ilustrating chromosomes in defined pictures referred to as karyotypes. In consequence, they are chromosome features that can be used in order to categorize different samples.
what is 9 + 10??? VERY IMPORTANT
Answer:
9 + 10 = 19
the answer is = 19
Which are examples of active transport across the cell membrane? a. osmosis and diffusion b. diffusion and facilitated diffusion c. osmosis and chemiosmosis d. endocytosis and exocytosis
Answer:
d. endocytosis and exocytosis
Explanation:
These processes bring specific items in/out of the cell through active transport since the particles being brought in are generally large. Water for example, a much smaller particle, would use passive transport through the process of osmosis. Hope this helps!
Endocytosis and exocytosis are examples of active transport across the cell membrane.
Active transport is the movement of substances in and out of the cell through the membrane using energy and occurs against a concentration gradient.
Endocytosis is called the process by which cells incorporate into them molecules, large or small, that cannot pass through the cell membrane.An example is the endocytosis of the complex that is formed between receptor proteins of polypeptide or protein hormones at the level of the plasma membrane.
Exocytosis is the process by which different types of molecules contained in a cytoplasmic vesicle of a cell are secreted outwards.Insulin secretion is done in small pinocytosic vesicles that have insulin in colloidal dispersion, this secretion is in favor of a gradient, since insulin is more concentrated within the cell than in the extracellular space.
Therefore, we can conclude that endocytosis and exocytosis are examples of active transport across the cell membrane.
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The results of gel electrophoresis are shown below. What can you determine
about the DNA from looking at the results of this test?
electrode
A. Strand 1 is the smallest.
B. Strand 2 is larger than strand 3
C. Strand 3 is larger than strand 4.
D. Strand 4 is the smallest
Answer:
A
Explanation:
Gel electrophoresis is an amazing technique that allows for DNA separation based on size (as in, length). Using electricity (and keeping in mind that DNA has a negative charge because of the phosphate groups), the shortest pieces will migrate the farthest.
So we can tell that the pieces are in ascending order of size. 4>3>2>1, in length.
A. Strand 1 is the smallest.
Answer:Given results of gel electrophoresis shows that strand 1 is smallest. The pieces are arranged in ascending order of size 4>3>2>1 . Thus,option A is correct.
Explanation:
What is Gel electrophoresis?
Gel electrophoresis is a laboratory technique used to separate mixture of DNA ,RNA or protein according to their molecular size.
The gel used in this technique is composed of polyacrylamide or agarose.
The main application of gel electrophoresis has been in the seperation of molecules and in restriction mapping.
The main advantage of gel electrophoresis is its capability to
simultaneously separate various samples in one round.
Therefore, strand 1 is the smallest according to the result of gel electrophoresis shown in figure. Thus, option A is correct.
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Sleve tubes are found in which vascular tissue?
OA. phloem
OB. xylem
Oc.
tracheids
Answer:
A. phloem
Explanation:
II. PARTS OF THE DIGESTIVE TRACT A. ORAL CAVITY After ingestion, the physical breakdown of solid foods (mechanical digestion) begins in the oral cavity (mouth). Describe how food is mechanically digested in the oral cavity. Include a discussion of how the teeth, tongue, and saliva work together to convert solid food into a moist, semi-solid mass of food called a bolus. Example: think of how a hard, dry saltine cracker is converted into a moist ball (bolus) in the mouth. B. PHARYNX and ESOPHAGUS 1. After food has been mechanically digested, mixed with saliva, and a bolus has formed, it is swallowed. Swallowing moves the bolus from the mouth into the esophagus. Discuss the events that occur during swallowing. 2. Which portions of the pharynx does food pass through when swallowing
Answer:
This begins with the gradual breaking down of the food in the mouth, by grinding the food substances with the teeth this is mastication, and the secretion of saliva, which moisten the food, soften it so that the salivary amylase enzyme, carried out the mechanical digestion.
Swallowing is a wavelike muscular contraction which involve the contraction of the longitudinal and circular muscles of the oesophagus, which pushes the bolus down to the stomach.
The food pass Oropharynx. While the epiglottis prevents the bolus from entering the trachea.
This is followed by the rolling up of the tongue, the pushing the broken down food now chyme towards the back of the mouth, pressing it against the soft palate. At this stage a bolus is formed.From here it is pushed into the throat,where it is pushed down the oesophagus by peristalsis.
Explanation:
Plants combine carbon dioxide and water to make what
substance?
O A. Glucose
O B. Ammonia
O C. Peptide
O D. Nitrogen
SUBMIT
Answer:
A. glucose right good brilliant
Why to use small beads for immobilizing enzymes
Answer:
Explanation:
Effects of bead size and bead amount on enzyme activity. Beads containing crude enzyme were prepared in the presence of sodium alginate (2% w/v) in CaCl 2 (5% w/v) solution. Each treatment was performed in triplicate.
Why does the growth of dodder eventually lead to the death of a host plant?
Answer:
it deprives the plant of nutrients
Explanation:
Chemical equilibrium results if____.
Answer:
forward reaction rate equals reverse reaction rate
Explanation:
Technology is often used in farming and agriculture. For example, farmers often use airplanes to spray chemicals on crops rather than spraying smaller amounts by hand. Which of the following is a negative side of using this technology?
_________16. Which one of the following should NOT be associated with electron transport chain?
A. Absorption of solar energy C. Movement of H+
B. Formation of ATP D. Cytochromes
