NAT 210

The "lock-and-key" model is use to describe the functioning of: A: enzymes B: collagen molecules C: keratin molecules D: both a and c above

A: Enzymes

The largest human cell is about how much larger than the smallest human cell? A : about 20 times larger B : about 10 times larger C : about 5 times larger D : about twice as large

A: about 20 times larger

The organelles that consist of a network of canals that wind through the cytoplasm are the: A: endoplasmic reticulum B: flagella C: Golgi apparatus D: lysosomes

A: endoplasmic reticulum

This molecule is found in DNA but not RNA: A : adenine B : ribose sugar C: deoxyribose sugar D: phosphate

C :deoxryibose suger

The atomic mass of an atom is equal to the number of: a- electrons b- neutrons c- protons d- both b and c above

D: Both b and c

Which of the following is the steroid lipid? A: cholesterol B: triglycerides C : enzymes D: phospholipids

A :cholesterol

Which of the following is not true of mitochondria? A : make protein for the cell B: are the site of cellular respiration C: are composed of two membranous sacs, one inside the other D: contain DNA

A :make protein for the cell

What type of tissue is pseudostratified tissue? A: epithelial tissue B: connective tissue C: muscle tissue D: nervous tissue

A: epithelial tissue

The diffusion of water through a selectively permeable membrane is a process called: A: osmosis B: dialysis C: filtration D: pinocytosis

A: osmosis

Which of the following is not true of water? A Water is the most abundant organic compound in the body. b Water is found both in and around the cells of the body. c Water is the solvent in which most other compounds are dissolved. d All of the above are true of water.

A:- Water is the most abundant organic compound in the body.

The magnesium atom has two electrons in its outer energy level and is willing to donate both of them. The chlorine atom has seven electrons in its outer energy level and will accept one electron. The chemical formula for the compound formed by magnesium and chlorine would be: A : Mg2Cl B : MgCl2 C : MgCl D : Mg2Cl2

B :MgC12

The molecules that stabilize the cell membrane and prevent it from breaking easily are the: A: phospholipid molecules B: cholesterol molecules C: protein molecules D: all of the above

B: cholesterol molecules

What type of tissue is blood? A: epithelial tissue B: connective tissue C: muscle tissue D: nervous tissue

B: connective tissue

Which of the following is not part of the cytoskeleton of the cell? A: microtubules B: endoplasmic reticulum C: microfilaments D: all of the above are part of the cytoskeleton Instructor Explanation: p. 40

B: endoplasmic reticulum

When the body removes CO2 by way of the respiratory system: A: it lowers the pH of the blood B : it raises the pH of the blood C : it has no effect on pH because CO2 is neither an acid nor a base D : it is acting as a buffer

B: it raises the ph of the blood

: If an atom had 20 protons and 18 electrons, it would: A : have a negative 2 charge B : have a plus 2 charge C : be attracted to a positively charged ion D : both a and c above

B: would have a two plus charge

Compounds are: A pure substances B made up of only one type of atom C made up of two or more different types of atoms D both a and b above

C :Made up of two or more different types of atoms

An isotope is an atom with: A: more protons than electrons B :more electrons than protons C : the same number of protons but different number of neutrons D :either a or b above

C :The same number of protons but different number of neutrons

The ideal body-fat percentage is considered to be: A: 8% to 12% for men and 12% to 15% for women B: 12% to 18% for men and 25% to 30% for women C: 12% to 18% for men and 18% to 24% for women D: 18% to 24% for both men and women

C: 12% to 18% for men and 18% to 24% for women

: Which of the following is not a function of the endoplasmic reticulum? A: receive proteins after they have been made by the ribosome B: produce new cell membrane for the cell C: digest microbes that may have entered the cell D: provide a route of transport from one part of the cell to another

C: digest microbes that may have entered the cell

Which of the following is not true of cholesterol? A: It is a steroid lipid. B : It helps stabilize the cell membrane. C : It contains only two fatty acids. D: It is the starting point for making the hormone estrogen.

C: it contains only two fatty acids

Organic compounds must contain: A : oxygen B : carbon-oxygen bonds C : hydrogen-oxygen bonds D : none of the above Instructor Explanation: p. 23

D :none of the above

This element is not one of the elements that makes up 96% of the body. a nitrogen b hydrogen c oxygen d sodium

D Sodium

This subatomic particle is found in the nucleus of the atom. A : electron B : neutron C : proton D : both b and c above

D both b and c

Because of complementary base pairing, if one side of a DNA molecule was ATCCGTAATC, the other side of the molecule would be: A: ATCCGCTAATC B: AUCCGCUAATC C: UAGGCGAUUAG D: TAGGCATTAG

D: TAGGCATTAG

Which of the following is found in the nucleus of the atom? A : proton B : neutron C : electron D : both proton and neutron

D: both proton and neutron

The organelles that are rod-shaped structures made of fine tubes and are important in cell division are the: A: ribosomes B: mitochondria C: Golgi apparatus D: centrioles

D: centrioles

Axons and dendrites usually are found in cells of which tissue? A : epithelial tissue B : connective tissue C: muscle tissue D : nervous tissue

D: nervous tissue

What type of tissue are glia cells? A: epithelial tissue B: connective tissue C: muscle tissue D: nervous tissue

D: nervous tissue

Which tissue allows rapid communication between body structures? A: epithelial tissue B: connective tissue C: muscle tissue D: nervous tissue

D: nervous tissue