The major criteria used in placing bacteria into different groups is based on differences in
A. cell wall structure.
B. cell membrane permeability.
C. presence or absence of flagella.
D. detergent susceptibility.
A
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What conclusions are consistent with these data? (Select all that apply.)
A researcher is studying the rII locus of phage T4. Three rII- strains are obtained: A, B, C, and D. In the first experiment, E. coli strain K(?) is coinfected with two rII- strains simultaneously and the results are recorded. Infection with A and B phage = plaques form Infection with A and C phage = plaques form Infection with B and C phage = no plaques form Infection with B and D phage = no plaques form Infection with C and D phage = no plaques form In a second experiment, coinfections are performed first in E. coli strain B, then the progeny phage are used to infect E. coli strain K(?). Progeny of A and B phage = plaques form Progeny of B and C phage = plaques form Progeny of C and D phage = plaques form Progeny of B and D phage = no plaques from A) Strains B and D both carry the same mutation. B) Strains B, C, and D carry mutations in the same gene. C) Strain A carries a mutation in a different gene than strains B, C, and D. D) Strains A and B carry mutations in the same gene. E) Strains B and C both carry the same mutation. F) A, B, C, and D carry mutations in the same gene.
Why is more than one sperm needed for fertilization to occur, when only one sperm actually penetrates the egg?
a. the sperm work together to lower the acidity in the uterus for survival b. the sperm work together reduce drag as they swim up the oviduct c. the sperm work together to surround the egg prior to fertilization d. the sperm work together to break down the egg's protein layer e. the sperm work together to break down the cap on the sperm's head
A couple already has 9 children, and they are all girls. If they decide to have a 10th child, it has a 50% chance that it will be male and a 50% chance that it will be female
Indicate whether the statement is true or false
Allergies occur when
A) too much complement is released into the blood. B) antibodies malfunction and attack "self" cells. C) mast cells release histamine in response to harmless substances. D) foreign MHC proteins trigger an immune response.