Most biological molecules are joined by
A) hydrogen bonds.
B) peptide bonds.
C) covalent bonds.
D) ionic bonds.
E) disulfide bonds.
C
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Answer the following statements true (T) or false (F)
1. The fast block to polyspermy occurs through a rapid increase in cytosolic calcium within the egg. 2. The sperm and its DNA enters the egg through simple diffusion through the egg plasma membrane. 3. The cortical reaction prevents multiple sperm from contributing their chromosomes to the egg. 4. The endoderm is a germ cell layer that tends to cover the embryo.
A cell or cell component that changes in response to specific stimuli is a(n) ________
a. feedback mechanism b. effector c. receptor d. integrator
What characteristic is common to most chordates, but is not a necessity?
a. Vertebrate b. Pharyngeal gill slits c. Postanal tail d. Notochord
Which method would be the MOST powerful approach to isolating a single mutant from a population of billions?
a. assay for the loss of function b. replica plating c. selection for a gain of function d. screen for the mutant