Cleavage in a frog embryo takes place more quickly in the vegetal half
Indicate whether the statement is true or false.
ANS: F, animal
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When we say that DNA replication is semiconservative, we mean that:
A. only half of an organism's DNA is replicated during each cell division. B. when DNA is replicated, each new double helix contains one parental strand and one newly synthesized daughter strand. C. when DNA is replicated, one double helix contains both parental strands and one contains two newly synthesized daughter strands. D. parental DNA stays in the parent cell and daughter DNA ends up in the daughter cell. E. None of the answer options are correct.
According to the Oparin-Haldane hypothesis, which of the following was probably NOT a major
component of Earth's early atmosphere?
a. O2 (oxygen) b. H2 (hydrogen) c. CH4 (methane) d. H2O (in vapor form) e. NH3 (ammonia)
Oral contraceptives work by _____
a. changing the pH of the uterus so sperm cannot live b. changing the temperature of the uterus so sperm cannot live c. blocking the entrance to the uterus d. killing sperm e. preventing ovulation
muncipal solid waste (MSW)
What will be an ideal response?