You stumble upon an unidentified arthropod with no antennae and eight legs. This organism is likely closely related to
_____.
a. grasshoppers
b. ticks
c. crayfish
d. millipedes
e. trilobites
ANSWER: b
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Spermatophytes are
A. all plants that produce sperm. B. all living and fossil seed plants. C. all plants that have tracheids and phloem. D. all woody plants.E. all plants with a sporic life cycle.
The route followed by a sperm from production to fertilization in a flowering plant is:
A. A pollen grain is produced in the anther, transported to a stigma where it produces two sperm cells that pass through a pollen tube that grows down the style to the ovary. One of the sperm cells enters the ovule and joins with the egg cell. B. A pollen grain is produced in the pistil, which explosively ejects it into the air where it is transported to a stigma where it forms two sperm cells. One of the sperm cells passes through a pollen tube that grows down the style to the ovary, enters the ovule and joins with the egg cell. C. A sperm cell, enclosed in a pollen grain with another sperm, is produced in the filament, transported to a stigma where it passes through a pollen tube that grows down the style to the ovary, enters the ovule and joins with the egg cell. D. A sperm cell, enclosed in a pollen grain with another sperm, is produced in the anther, transported to the pedicel where it passes through a pollen tube that grows down the style to the ovary, enters the ovule and joins with the egg cell. E. A sperm cell is produced in the anther, transported to a stigma where it becomes enclosed along with another sperm cell into a pollen grain that grows down the style to the ovary, enters the ovule and joins with the egg cell.
What are the two types of nucleic acid?
a. mRNA and tRNA b. mDNA and rRNA c. DNA and RNA d. none of the above (there is only one type of nucleic acid and it is DNA)
People with oxidative phosphorylation disorders suffer a lack of energy that can lead to diminished function of nerve and muscle cells. The organelle most likely to be altered in oxidative phosphorylation disorders is the:
A) rough endoplasmic reticulum. B) chloroplast. C) cytoskeleton. D) mitochondrion. E) cell wall.