Which of the following is NOT a characteristic of plant cells?
A. Plasmodesmata are present.
B. Plastids are present.
C. Centrioles are present during mitosis.
D. Cell wall is present.
Answer: C
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The ____ joints, found in the vertebrae and some rib bones,have fibrous connective tissue covering the ends of the
bones involved and are somewhat moveable.
a. synovial b. cartilaginous c. fibrous d. agonist e. antagonistic
Polymerization of nucleotides to form nucleic acids involves the formation of _______ bonds.
a. peptide b. phosphodiester c. glycosidic d. hydrogen
Arsenic poisoning can lead to organ failure and death. Though arsenic can inhibit or interfere with a number of cellular enzymes, arsenic poisoning is thought to be mainly due to indirect inhibition of enzymes involved in both pyruvate oxidation and the Krebs cycle. As a result, this compound must be able to enter which cellular compartment?
A. the intermembrane space of the mitochondria B. the nucleus C. the endoplasmic reticulum D. the cytoplasm E. the mitochondrial matrix
Carbon dioxide levels in the blood and in cerebrospinal fluid affect pH of these fluids. This enables the organism to sense a disturbance in gas levels as ________.
A) the brain directly measures and monitors oxygen levels and causes breathing changes accordingly B) neurons in contact with cerebrospinal fluid monitor pH and use this measure to control breathing C) the brain alters the pH of the cerebrospinal fluid to force the animal to retain more or less carbon dioxide D) stretch receptors in the lungs cause the medulla oblongata to speed up or slow breathing E) the medulla oblongata is able to control the concentration of bicarbonate ions in the blood