The excretory product in protozoans is

A. amino acid

B. uric acid

C. ammonia

D. urea

Which of the following is a living organism?

A. Muscle

B. Nucleus

C. Yeast

D. Mitochondrion

Which of the following organisms is the most specialized ?

A. paramecium

B. Amoeba

C. Spirogyra

D. Rhizopus

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 cell inclusions can destroy other cell organelles?

A. Centriole

B. Ribosome

C. Lysosome

D. Mitochondrion

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

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.

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

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