Which of the following happens right after the acrosomal reactions to prevent additional sperm from entering the egg?
a. The blastocyst is formed.
b. The trophoblast is formed.
c. The blastula is formed.
d. Cleavage happens immediately.
d. Cleavage happens immediately.
Cleavage happens immediately after the acrosomal reactions to prevent additional sperm from entering the egg.
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When a steroid hormone and a peptide hormone exert similar effects on a population of target cells, then _____
A) the steroid and peptide hormones must use the same biochemical mechanisms B) the steroid and peptide hormones must bind to the same receptor protein C) the steroid hormones affect the synthesis of effector proteins, whereas peptide hormones activate effector proteins already present in the cell D) the steroid hormones affect the activity of certain proteins within the cell, whereas peptide hormones directly affect the processing of mRNA E) the steroid hormones affect only the release of proteins from the target cell, whereas peptide hormones affect only the synthesis of proteins that remain in the target cell
Consider the data in Fig. 46.11 illustrating the survivorship curve of the Lime Swallowtail butterfly. As indicated in your text, the survivorship from the egg to larval stage is 68%
Calculate the survivorship from the larval to pupal stage
Which of the following organisms could result from a developing embryo where the mouth
develops second?
a. earthworm b. clam c. beetle d. starfish
__________, products of master genes, act as long-range signals that diffuse out from a source and form a
concentration gradient. Fill in the blank(s) with the appropriate word(s).