Which of the following determines genetic sex (male or female) in mammals?
A. the genetic makeup of the parents
B. the Y chromosome contained in the egg
C. the SRY gene on the Y chromosome
D. the temperature of the developing fetus
E. the acrosome of the sperm
Answer: C
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The Earth formed approximately
(a) 4600 years ago. (b) 1 million years ago. (c) 1 billion years ago. (d) 4.6 billion years ago.
In photosynthesis, ATP and NADPH are produced during:a
the carbon fixation reactions. b. the light-dependent phase. c. the light-independent phase. d. glycolysis. e. photolysis
Arrange the events of a second messenger system in the correct order
1) protein kinase is activated 2) G protein is activated 3) neurotransmitter binds to its receptor 4) protein closes potassium channel 5) cyclic AMP is produced 6) phosphorylation takes place a. 1 ? 2 ? 5 ? 6 ? 4 ? 3 b. 3 ? 5 ? 6 ? 1 ? 2 ? 4 c. 5 ? 2 ? 6 ? 1 ? 3 ? 4 d. 3 ? 2 ? 5 ? 1 ? 6 ? 4 e. 5 ? 2 ? 6 ? 1 ? 4 ? 3
Which is incorrect about meiosis?
A. Sister chromatids separate in anaphase I. B. Meiosis I results in 2 haploid cells. C. Meiosis II is like mitosis. D. Chromosome replication only occurs in interphase I. E. Crossing over occurs in prophase I.