Which of the following is a symptom of vitamin A deficiency?

A) blindness
B) severe combined immunodeficiency disease (SCID)
C) anemia
D) blood doping
E) diabetes


Ans: A) blindness

Biology & Microbiology

You might also like to view...

Aquatic animals that rely on external fertilization for reproduction have a low probability of successful fertilization. Which of the following is a mechanism used to increase the liklihood of successful external fertilization?

A. courtship rituals to synchronize male/female gamete release B. depositing sperm into the female reproductive tract C. production of extremely large number of gametes that are released simultaneously D. containment of sperm within spermatophores

Biology & Microbiology

A couple has been trying unsuccessfully to conceive for several years. An examination reveals that scar tissue blocks the woman's uterine tubes

The woman has complained about large amounts of vaginal discharge, which coincide with her husband complaining of painful urination and a pus-filled discharge from his penis. Antibiotics clear up the infections. This couple has probably been infected with A) a protist. B) HPV. C) herpes. D) pubic lice. E) gonorrhea.

Biology & Microbiology

____ strips an area of vegetation and soil, creating an ecological dead zone.

A. Biological magnification B. Renewable energy C. Ecological restoration D. Ground mining E. Surface mining

Biology & Microbiology

If a drug is designed to denature enzymes involved in digesting phenylalanine, why would patients treated with this drug develop phenylketonuria?

What will be an ideal response?

Biology & Microbiology