Which of the following choices correctly describes the composition of the cell membrane?
contains only lipids
contains lipids and protein
contains lipids and cytosol
contains only proteins
Correct answer is B
It consists of a lipid bi-layer with embedded proteins. The basic function of the cell membrane is to protect the cell from its surroundings.
The cell membrane controls the movement of substances in and out of cells and organelles. In this way, it is selectively permeable to ions and organic molecules.
Coloration of the eye is ______ variation
physiological
morphological
adaptive
recessive
Correct answer is B
Eye coloration is a caused by morphological variation.
Use the diagram below to answer the question that follow:
hygrometer
Wind vane
Anemometer
rain gauge
Correct answer is C
An anemometer is a device used for measuring wind speed, and is also a common weather station instrument.
What is the primary function of cofactors?
To aid in enzyme function
To synthesize enzymes
To inhibit enzymes
To break down old enzymes
Correct answer is A
Most enzymes do not function optimally, or even at all, unless bound to other non-protein helper molecules called cofactors.
The joint between the femur and tibia is known as ________?
hinge joint
ball-and-socket joint
pivot joint
gliding joint
Correct answer is A
The knee joint is one of the strongest and most important joints in the human body. It allows the lower leg to move relative to the thigh while supporting the body’s weight.
Movements at the knee joint are essential to many everyday activities, including walking, running, sitting and standing.
The knee, also known as the hinge joint(tibiofemoral joint) formed between three bones: the femur, tibia, and patella.
A gliding joint, also known as a plane joint or planar joint, is a common type ofjoint formed between bones that meet at flat or nearly flat articular surfaces.
Pivot joint, also called rotary joint is a freely moveable joint that allows only rotary movement around a single axis. Pivot joints also provide for the twisting movement of the bones of the forearm (radius and ulna) against the upper arm.
The ball and socket joint (or spheroidal joint) is a type of synovial joint which enables the bone to move in many places (nearly all directions). These are found in the hip.
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