In: Biology
In: Biology
In: Biology
In: Biology
The immune system (select the MOST CORRECT statement)
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The second exposure to a given antigen leads to a rapid adaptive immune response that reaches its peak (as measured by antibody concentration in plasma) within 3-4 days. |
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Granzymes are synthesized by both cytotoxic T cells and Natural Killer Cells and are stored in secretory vesicles. |
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Granzymes are specialized enzymes that can diffuse across the plasma membrane of cells without the help of a channel or carrier protein. |
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Both a) and b) are correct and c) is incorrect |
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a), b) and c) are all correct |
Digestion of food (select the MOST CORRECT statement)
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Cnidarians such as Hydra have a gastrovascular cavity and use both extracellular and intracellular digestion. |
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The gastrovascular cavity of Hydra is used for both nutrient absorption and gas exchange. |
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Birds have a structure called the gizzard that is specialized for the absorption of nutrients. |
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Both a) and b) are correct and c) is incorrect |
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a), b) and c) are all correct |
In: Biology
Suppose you are at a party, and one of your human friends decides to run around the room screaming "I'm a jawed fish." It's not a costume party, so the other guests look at your friend a bit oddly-- actually a lot oddly-- and they edge away. But you stand up and say that your friend is right. Assuming that the other partygoers are trained in phylogenetic systematics, what argument could you make to convince them? Your answer will be most convincing if it is constructed in complete sentences and uses specific and appropriate terms (spelled correctly); you could also use figures to help illustrate the point you are making.
In: Biology
How many types of DNA ligases? and describe the (Weiss unit) used to determine the concentration these DNA ligases?
In: Biology
PART 1
You will want to solve this problem as a Punnett square and use that to answer the questions below. You may select multiple answers for the genotypes, and just one answer for the phenotypic ratio.
Predict the genotypes of the F1 offspring and phenotypic ratios of these offspring that would result from the following fruit fly crosses:
Cross B: a cross between a sepia-eyed male and a white-eyed female (male genotype = Xw+Y se se ; female genotype = XwXw se+se+ )
PART 2
What is the number of each phenotype would you predict in the offspring of F1xF1 crosses of B that you described above if you looked at 16 offspring?
Note: You will have to think carefully about what phenotype is going to show in the case of XwXwse se and XwYse se (double homozgyous recessive male or female)
Write only the numbers of predicted offspring in each box, for example: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, or 16. Do not use any words, spaces, or punctuation - just a number. All of your blanks together should add up to 16.
__: WT (Red eyed) males
__: Sepia eyed males
__: White eyed males
__: WT (Red eyed) females
__: Sepia eyed females
__: White eyed females
In: Biology
List THREE Muscle Tissues. In SIX different ways, Compare and Contrast between the three Muscle Tissue types.
In: Biology
How is complementary base pairing restricted?
A. One complementary set of bases creates two hydrogen bonds and the other set form 3 hydrogen bonds
B. the two bonded pyrimidines are too small to cover the space in the double helix of DNA
C. the two purines that are bonded are too big to fit in double helix
D. all of the above
What happens when the translocation of a tRNA from one ribosome binding site to another?
A. tRNA and initiation factors interacy
B. Ribosome shifts 3 nucleotides down mRNA
C.release factor binds to ribosome
D. ribosomal unit dissociates
In: Biology
Q)In analyzing a DNA sample the molar amount of
adenosine is 30 %. Given this information and applying Chargaff's
rules, determine the following:
a. Percentage of thymidine /T?
b. percentage due to cytidine /C?
c. percentage due to Guanosine /G ?
d. Percentage due to uridine /U?
5. What is the resulting product when you replicate this sequence :
5- ATCCG -3
In: Biology
In: Biology
In: Biology
Imagine a species of bison in which most individuals have a brown coat color, but some individuals have white coats. The coat phenotype is due to a single locus called C. The brown allele (C1) is dominant over the white allele (C2). The possible genotypes are: C1C1 à brown coat; C1C2 à brown coat; C2C2 à white coat. At this time, the population is in Hardy-Weinberg equilibrium. There are 450 bison in the population and 175 of them have white coats.
A. What are the allele frequencies? (2 pts) B. What are the genotype frequencies? (2 pts) C. Again, assuming Hardy Weinberg, what are the allele frequencies in the next generation of bunnies produced by these adult rabbits? (2 pt) D. Now assume that wolves who like to eat bison can spot the ones with white coats twice as easily as the brown ones (it is summer, not winter in North Dakota). If you start again with a population of 450 bison including 175 white ones and wolves eat 35 white, 20 heterozygous brown and 10 homozygous brown bison, then what are the genotype frequencies AFTER the wolves have their dinner? (2 pts) E. What are the allele frequencies in the gene pool of gametes produced by the survivors? (2 pt) D. What will be the allele frequencies in the population of baby bison produced in the next generations, assuming that the population is now is Hardy-Weinberg equilibrium (there was random mating and not predation on the babies, etc)(2pts)?
In: Biology
In: Biology