This structure separates a cell from its surroundings:
A. plasma membrane
B. nuclear envelope
C. cytoplasm
D. nucleiod
E. organelle
B. nuclear envelope
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When pair-rule genes and segment-polarity genes are mutated, larvae display disturbances in segmentation patterns
A. true B. false
If a virus is referred to as naked, it means it lacks which structure?
a. Protein coat b. Capsid c. Envelope d. Nucleocapsid
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.
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