Which phase occurs during mitosis?
A) first gap phase
B) metaphase
C) second gap phase
D) S phase
B
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The following question(s) relate to the data table below, showing typical fluctuating pH and dissolved oxygen levels in a fish pond with a heavy concentration of algae over a 24-hour period.TimeOxygen (ppm)pH2 a.m.4.57.74 a.m.2.87.26 a.m.2.26.88 a.m.2.56.810 a.m.3.97.2Noon6.57.72 p.m.10.08.34 p.m.12.18.86 p.m.13.19.28 p.m.13.09.210 p.m.12.08.8Midnight10.88.3In such a pond that contains algae and fish, what is happening to the oxygen?
A. Oxygen is only consumed by the fish B. Oxygen is only consumed by both the algae and the fish C. Oxygen is only produced by the algae D. Oxygen is produced by the algae, and consumed by the algae and the fish
Individuals with the progeria syndrome
a. number about one in eight million. b. will have an accelerated rate of aging. c. usually die in their teens. d. carry a mutant gene for a nuclear structural protein. e. are all of these.
What determines the gender of a human fetus?
a. presence of an SRY gene b. presence of X and Y chromosomes c. absence of an X chromosome d. the sex chromosomes in the egg e. the presence of estrogen
Choose the true statements about the evolution of complex characters, such as powered flight.
A. The intermediate stages in the evolution of a complex character had no fitness advantage. B. Often the initial stage in the evolution of a complex character was an adaptation to some unrelated selection pressure. C. Phylogenetic analysis using cladistics can help reveal the sequence leading to the evolution of a complex character. D. Usually a single mutation in one gene leads to the simultaneous appearance of the complex character.