This structure separates a cell from its surroundings:

A. plasma membrane
B. nuclear envelope
C. cytoplasm
D. nucleiod
E. organelle


B. nuclear envelope

Biology & Microbiology

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When pair-rule genes and segment-polarity genes are mutated, larvae display disturbances in segmentation patterns

A. true B. false

Biology & Microbiology

If a virus is referred to as naked, it means it lacks which structure?

a. Protein coat b. Capsid c. Envelope d. Nucleocapsid

Biology & Microbiology

Which layer of the skin is composed of stratified squamous epithelium cells? a. Epidermis b. All of these choices have stratified squamous epithelium

c. Hypodermis d. Dermis e. None of these choices have stratified squamous epithelium.

Biology & Microbiology

Oral contraceptives work by _____

a. changing the pH of the uterus so sperm cannot live b. changing the temperature of the uterus so sperm cannot live c. blocking the entrance to the uterus d. killing sperm e. preventing ovulation

Biology & Microbiology