Other Biology Answers

How is the biconcave shape of RBC maintained? Please explain.

Describe some of the features of cells that suggest that all living organisms are derived from a common ancestor.

In which part of female does the following events take place
1.release of Ist polar body
2.release of 2nd and 3rd polar body

1)_______ lack a nuclear membrane and membrane-bound organelles.
A)Plants

B)Animals

C)Bacteria

D)all of the above

1)_______ may have formed the oxygen released into the early atmosphere.
A)Saprophytic bacteria

B)Cyanobacteria

C)Symbiotic bacteria

D)none of the above

3)Gram-positive bacteria have a thick cell wall composed of
A)cellulose.

B)peptidoglycan.

C)glycogen.

D)none of the above

4)Gram-negative bacteria also have an additional outer _______ that resists the stain.
A)mitochondria

B)wall

C)membrane

D)none of the above

5)Which of the following is a way bacteria can cause disease?
a)destroying cells

B)releasing toxins

C)contaminating food

D)none of the above

6)Both Archaea and Bacteria used to be classified in which of the following kingdoms?
A)Protista

B)Animalia

C)Monera

D)none of the above

7)Archaea are most closely related to
A)bacteria.

B)eukaryotes.

C)both a and b

D)none of the above

8)Where could you find mesophiles?
A)sewage treatment plants

B)marshlands

C)typical soil

D)all of the above

9)Most Archaeans lack a peptidoglycan


A)operon.

B)nucleoid.

C)cell wall.

D)none of the above

10)The most ancient bacteria fossils were found in


A)tar pits.

B)the desert.

C)marine rocks.

D)none of the above

name the type of immunity provided by vaccines&colostrum in human being .mention one difference between them?

How does blood move from lower parts of your body to heart against the force
of gravity ?

which part of the brain controls respiration process?also heart beat and peristalsis?

is the finger prints of twins are same?

Can keeping animal's captive in zoo be justified in terms of preserving biodiversity?