Which of the following restriction enzyme sites would produce blunt-ended fragments? (The arrow represents the cutting site of the enzyme.)
A. C?CGG
B. G?GATCC
C. G?AATTC
D. CCC?GGG
E. A?AGCTT
Answer: D
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Peroxisomes
A) are not derived from the endoplasmic reticulum. B) are bounded by double membranes. C) possess acid phosphatase activity. D) possess amylase activity. E) all of the above
The area where the optic nerve leaves the retina and where photoreceptors are absent is called the ________
A) optic area B) blind spot C) fovea D) cornea
Cells must constantly bring in certain molecules and ions while keeping others out. What part of the cell accomplishes this function?
a. the vesicles b. the plasma membrane c. the nucleus d. the lysosomes
Which of the following statements is true?
(a) Another name for the fertilized egg cell is the zygote. (b) Diploid organisms reproduce only sexually. (c) All sexually reproducing organisms must have two copies of every chromosome. (d) Gametes have only one chromosome.