The stem apical meristem gives rise to:
a. leaf primordia.
b. lateral meristems.
c. root caps.
d. root hairs.
e. cork cells.
a
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Which carbohydrate is used to strengthen the shell of
crabs? a. glucose b. lactose c. glycogen d. amylose e. chitin
In plant cells, auxin binds to a
a. cell surface receptor and triggers the ras/raf pathway. b. nuclear receptor that changes its shape so that it can bind to and activate genes. c. receptor ubiquitin ligase that stimulates the degradation of transcriptional repressors, resulting in activation of genes. d. cell surface molecule that stimulates fluid uptake.
The symptoms of pellagra are due to a lack of
A) riboflavin. B) thiamin. C) pantothenic acid. D) pyridoxine. E) niacin.
MPF activity was discovered when cytoplasm from a Xenopus M-phase cell was injected into Xenopus oocytes, inducing the oocytes to form a mitotic spindle
In a control experiment, Xenopus interphase cytoplasm was injected into oocytes and shown not to induce the formation of a mitotic spindle. Which of the following statements is not a legitimate conclusion from the control experiment? (a) The piercing of the oocyte membrane by a needle is insufficient to cause mitotic spindle formation. (b) An increased volume of cytoplasm is insufficient to cause mitotic spindle formation. (c) Injection of extra RNA molecules is insufficient to cause mitotic spindle formation. (d) Components of an interphase nucleus are insufficient to cause mitotic spindle formation.