The legs of an accident victim with a fractured vertebral column and injured spinal cord could not be raised because
- A. impulses fromreceptors in the legs cannot travel to the brain
- B. impulses from the brain cannot travel to the legs
- C. chemical substances will be released at synapses in the central nervous system
- D. reflexx actions cannot take place in the legs
Which of the following processes is not a function of the mammalian skin?
- A. Regulation of body temperature
- B. Reception of external stimuli
- C. Excretion
- D. Gaseous exchange
Which of the following statements about asexual reproduction is correct? It
- A. always involves one parent but the offspring is genetically different from the parent.
- B. may involve two parents but the offspring is always identical to one parent
- C. always involves one parent and the offspring is genetically identical to the parent
- D. involves two parents but the offspring is not genetically identical to any of the parents
The following events occur during mitosis in a cell:
I. Chromatids separate;
II. Chromosomes become visible;
III. Chromosomes align at the equator
IV. Cytoplasm divides (Cytokinesis):
The correct sequence of the events is
- A. lll, ll,lV,l.
- B. ll, lll, l,lV
- C. ll, l, lll, lV
- D. II, IV, I, III.
In which of the following yam tissues will osmosis occur?
- A. Boiled and peeled
- B. Raw and peeled
- C. Boiled and unpeeled
- D. Roasted and peeled
Which of the following cell inclusions can destroy other cell organelles?
- A. Centriole
- B. Ribosome
- C. Lysosome
- D. Mitochondrion
Active transport can be defined as the movement of
- A. substances from a region of high concentration to a region of low concentration
- B. substances from a region of low concentration to a region of high concentration across a living cell membrane
- C. substances across a living cell membrane using energy from the cell
- D. movement of molecules in a medium
Which of the following organisms is the most specialized ?
- A. paramecium
- B. Amoeba
- C. Spirogyra
- D. Rhizopus
Which of the following is a living organism?
- A. Muscle
- B. Nucleus
- C. Yeast
- D. Mitochondrion
The excretory product in protozoans is
- A. amino acid
- B. uric acid
- C. ammonia
- D. urea