Study Guide for SCI (7th grade unit one)

Question 1

An example of a prokaryotic cell is a ___ cell.
a) plant
b) fungi
c) bacteria
d) animal

Answer 1

c) bacteria

Question 2

folded membranes are an advantage to a cell because____.
a) cell processes can be more efficient
b) the membranes provide a large surface area
c) the membranes form interconnected compartments
d) all of these

Answer 2

d) all of these

Question 3

who concluded that all plants are made of living thing cells?
a) virchow
b) hooke
c) Schwann
d) schleiden

Answer 3

d)schleiden

Question 4

what do electron microscopes use to focus and magnify an image?
a) glass lenses
b) x rays
c) electromagnets
d) light

Answer 4

c) electromagnets

Question 5

the scientist who first described living cells as seen through a simple microscope was___?
a) leeuwenhoek
b) schleiden
c) hooke
d) schwann

Answer 5

a) van leeuwenhoek

Question 6

one advantage of electron microscopes over light microscopes is their____?
a) size
b) higher magnification
c) two-dimensional image
d) use of live specimens

Answer 6

b) higher magnification

Question 7

because the phospholipid molecules and some proteins are free to move, the plasma membrane is said to be a ___.
a) bilayer
b) solid
c) fluid mosaic
d) fatty acid

Answer 7

c) fluid mosaic

Question 8

a plasma membrane is made up of a(n) ____?
a) cholesterol layer
b) enzyme bilayer
c) lipid bilayer
d) protein layer

Answer 8

c) lipid bilayer

Question 9

if a cell is placed in saltwater, water leaves cell by ____.
a) osmosis
b) diffusion
c) active transport
d) phagocytosis

Answer 9

a) osmosis

Question 10

cell structures that contain digestive enzymes are _____.

Answer 10

lysosomes

Question 11

in a cell, the sites of protein synthesis are the ___.

Answer 11

ribosome

Question 12

the small, membrane-bound structures inside a cell are ______.

Answer 12

organelles

Question 13

short, hair like projections used for locomotion are ______.

Answer 13

cillia

Question 14

the network of tiny rods and filaments that forms a framework for the cell is called the ____.

Answer 14

cytoskeleton

Question 15

the folded system of membranes that forms a network of interconnected compartments inside the cell is called the _______.

Answer 15

endoplasmic reticulum

Question 16

a light microscope that has two or more lenses is called a(n) ____ microscope.

Answer 16

compound

Question 17

cells are the basic units of structure and _____ in living things.

Answer 17

function

Question 18

the nucleus of a cell has thin strands of _____ that contains genetic material.

Answer 18

chromosome

Question 19

____ is a process by which a cell membrane surrounds and takes in material from the environment.

Answer 19

endocytosis

Question 20

a solution in which the concentration gradient of dissolved substance is lower than the concentration inside a cell is _____.

Answer 20

hypotonic, moved by osmosis

Question 21

what is the function of a golgi body?

Answer 21

it packages and sorts proteins in the cell

Question 22

what is the function of the mitochondria?

Answer 22

converts food into energy (ATP)

Question 23

what is the function of the cell wall?

Answer 23

it supports and shapes the structure of the plant cell.

Question 24

answer two:

41. describe the functions of the nuclear envelope, chromatin, and nucleolus.
42. what is the difference between an electron microscope and a compound microscope?
43. between which cell types is the difference greater–plant and animal cells or prokaryotic and eukaryotic cells? Give reasons for your answers.

Answer 24

valid answers