Normally, human fertilization occurs in the ____
a. vagina
b. cervix
c. ovary
d. uterus
e. oviduct
ANSWER: e
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Bacterial cells are placed into a 250mL liquid growth medium in a closed laboratory flask. According to Malthusian theory, they will reproduce exponentially and then:
A. continue reproducing arithmetically as long as there are no limitations on food supply. B. continue reproducing geometrically as long as there are no limitations on food supply. C. continue reproducing arithmetically until the food supply is used up, then they will cease to grow. D. continue reproducing geometrically until the food supply is used up, then they will cease to grow.
A eukaryotic cell G2-M checkpoint assesses the status of
A) DNA replication. B) chromosome attachment to kinetochore microtubules. C) nutrient abundance. D) mitotic cyclin degradation. E) the presence of growth factors.
Which plants drop their leaves on an annual basis?
A) annuals B) perennials C) deciduous D) biennials
All the following are true of companion cells EXCEPT that they
A) cooperate with sieve-tube elements in conducting sugar-rich solutions. B) are connected to sieve-tube elements via plasmodesmata. C) supply materials to repair the plasma membrane of sieve-tube elements. D) provide proteins and ATP to sieve-tube elements. E) fuse together to form the sieve plates of sieve-tube elements.