During gel electrophoresis, why does DNA move towards the anode?
Correct answer C. Its phosphate groups give it a negative charge
Subject / 1,067 questions
MDCAT Biology MCQs
Page 2 of MDCAT Biology multiple-choice questions with answers. Tap an option to check yourself.
Page 2 of 54
- Biological Molecules 74
- Coordination and Control 72
- Biology Diagnostic 70
- Cell Structure and Function 67
- Biotechnology 65
- Reproduction 58
- Bioenergetics 55
- Circulation 50
- Inheritance 48
- Digestion 45
- Immunity 45
- Support and Movement 45
- Acellular Life (Viruses) 45
- Homeostasis 45
- Respiration and Gaseous Exchange 45
- Evolution 45
- Enzymes 45
- Cell Cycle 41
- Chromosome and DNA 40
- Biology Introduction 38
- Ecosystem 27
In gel electrophoresis, which DNA fragments travel farthest from the wells?
Correct answer D. The smallest fragments
A linear DNA molecule has 3 recognition sites for a restriction enzyme. How many fragments are produced when it is completely digested?
Correct answer D. 4
Advertisement
Assuming bases occur randomly and equally often, how often would a 6-base-pair restriction site be expected to occur?
Correct answer D. Once in every 4096 base pairs
What is the basis of DNA fingerprinting?
Correct answer C. Individuals differ in the number of repeats in variable non-coding regions of DNA
On which cells in the testes does FSH act to support spermatogenesis?
Correct answer D. Sertoli cells
Which hormone stimulates the interstitial (Leydig) cells to secrete testosterone?
Correct answer D. Luteinising hormone (LH)
In which structure do sperm mature and gain the ability to swim before ejaculation?
Correct answer C. Epididymis
Why are the human testes located in the scrotum outside the abdominal cavity?
Correct answer B. Sperm production requires a temperature about 2 to 3 °C below core body temperature
Advertisement
Which accessory gland contributes a fructose-rich fluid that supplies energy to sperm?
Correct answer B. Seminal vesicle
Which duct carries sperm from the epididymis towards the urethra?
Correct answer A. Vas deferens
Where does fertilisation normally take place in the human female?
Correct answer A. Oviduct (fallopian tube)
Where does the human embryo normally implant?
Correct answer D. Endometrium of the uterus
Which event directly triggers ovulation in the menstrual cycle?
Correct answer D. A surge in luteinising hormone (LH)
What causes the sharp rise in LH just before ovulation?
Correct answer C. High oestrogen levels exerting positive feedback on the hypothalamus and pituitary
Advertisement
Which hormone is mainly secreted by the corpus luteum?
Correct answer D. Progesterone
What causes menstruation to begin when pregnancy does not occur?
Correct answer A. Degeneration of the corpus luteum and a fall in progesterone
Which hormone stimulates the growth of ovarian follicles at the start of the menstrual cycle?
Correct answer B. Follicle-stimulating hormone (FSH)
What is the main effect of rising oestrogen during the follicular phase?
Correct answer A. Repair and thickening of the endometrium
Why does a home pregnancy test detect human chorionic gonadotrophin (hCG) in urine?
Correct answer B. hCG is produced only by the early embryo and placenta