Thorough mixing of oxygen and nutrients within a lake occurs in:
a. winter and summer
b. winter and spring
c. spring and summer
d. spring and autumn
e. summer and autumn
d
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In the process of blood clotting, which of the
following do platelets do?
a. engulf and digest cellular debris b. release substances that repel more platelets c. convert fibrin into fibrinogen d. clump together e. platelets do all of these
Which of the following choices represents the correct
sequence? a. microspores >>> meiosis >>> gametophyte >>> sperm b. meiosis >>> microspores >>> gametophyte >>> sperm c. gametophyte >>> meiosis >>> megaspores >>> eggs d. meiosis >>> gametophyte >>> megaspores >>> eggs e. gametophyte >>> mitosis >>> megaspores >>> eggs
These contain enzymes and are the main organelles of intracellular digestion
a. Golgi bodies b. ribosomes c. mitochondria d. lysosomes e. endoplasmic reticula
The only endocrine gland whose secretory function is under direct control by sympathetic nerves is the
a. pancreas. b. thyroid. c. adrenal medulla. d. thymus. e. testis.