Correct Answer: C. determining the genetic makeup of specimens

Explanation

(a) A receptor; is a sensory cell which receives stimuli, initiates and transmits an impulse through neurons to the brain, spinal cord or the central nervous system.

(b) General features common to all receptors: Generally, receptors consist of a group of sensory cells with their free surfaces bearing, short hair-like processes otherwise called dendrites. Around their basal portions are nerve fibres which lead to the spinal or cranial nerves and the central nervous system.

(c) Diagram showing the outer/external and middle ear of human.

(ii) How to care for the ear: (i) avoid inserting sharp objects into the ear (ii) clean regularly with cotton buds (iii) report any ear discharge or problem to the medical doctor (iv) avoid places of loud noise (v) avoid misuse of ear-phones (vi) avoid introducing hot liquid into the ear (vii) treat measles and meningitis instantly to prevent deafness (viii) avoid using quinine carelessly

Correct Answer: B. stimulate the body to produce antibodies

Correct Answer: C. have intermediate hosts

Correct Answer: A) transmit vibrations

Explanation

The question is asking about the function of the ossicles (malleus, incus, and stapes) in the mammalian ear. The mammalian ear is responsible for hearing and balance. The ossicles are three tiny bones located in the middle ear that play an important role in hearing. The correct option is A: transmit vibrations. When sound waves enter the ear, they travel through the ear canal and cause the eardrum to vibrate. The vibrations are then transmitted to the ossicles, which amplify the sound and transmit it to the inner ear. The inner ear contains the cochlea, which is filled with fluid and contains tiny hair cells that are responsible for converting the vibrations into electrical signals that the brain can interpret as sound. The ossicles play a crucial role in this process by transmitting the vibrations from the eardrum to the cochlea. Without the ossicles, the sound waves would be too weak to be detected by the hair cells in the cochlea. It is important to note that options B, C, D, and E are incorrect. The ossicles do not regulate pressures, support the inner ear, maintain balance during motion, or secrete oil. In summary, the function of the ossicles (malleus, incus, and stapes) in the mammalian ear is to transmit vibrations from the eardrum to the inner ear, where they are converted into electrical signals that the brain can interpret as sound.

Correct Answer: B. the body cells of the fish swelled and burst as a result of the hypotonic fresh water

Correct Answer: A. 12

Explanation

A somatic (body) cell is always diploid, meaning that it has 2n chromosomes. When a cell undergoes meiosis, the number of chromosomes in each daughter cell will be half the number in the original parent cell. Each daughter cell produced from meiosis will be haploid, meaning that it will have n chromosomes.

Correct Answer: B. respiratory system

Correct Answer: B. substances from a region of low concentration to a region of high concentration across a living cell membrane

Correct Answer: D. canine and incisors