Antigen presentation by MHC class 1 proteins is a signal for:
A. secretion of antibodies by B cells.
B. attack by cytotoxic T cells.
C. activation of cytotoxic T cells by helper T
cells.
D. cytokine release by helper T cells.
B
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You are given a new animal species to study. You note that it possesses segmentation. Knowing only that it is segmented, which of these are segmented? Check all that apply.
_____ Cnidaria. _____ Arthropoda. _____ Chordata. _____ Annelida. _____ Platyhelminthes.
If there are four pairs of chromosomes, how many different combinations of chromosomes are possible?
A. 2 B. 32 C. 8 D. 4 E. 16
The short nucleotide sequence that base-pairs with any complementary sequences in DNA during PCR is a(n) ____
a. primer b. exon c. intron d. restriction enzyme e. polysome
________ is the interaction between the products of two genes in which one of the genes modifies the phenotypic expression produced by the other.
Fill in the blank(s) with the appropriate word(s).