NAFS diagnostic test 1 part 2 2025/2026

Diabetes results mainly from problems in which organ?

• Heart

• Liver

• Pancreas

• Kidney

Which kingdom includes organisms that are prokaryotic?

• Protista

• Plantae

• Monera

• Fungi

What is the correct order of Linnaeus' taxonomic levels?

• Phylum → Kingdom → Class → Order → Family → Genus → Species

• Kingdom → Phylum → Class → Order → Family → Genus → Species

• Kingdom → Order → Class → Family → Genus → Species → Phylum

• Species → Genus → Family → Order → Class → Phylum → Kingdom

Who is considered the father of genetics?

• Charles Darwin

• Louis Pasteur

• Gregor Mendel

• Robert Hooke

An organism with genotype Aa is:

• Homozygous dominant

• Homozygous recessive

• Heterozygous

• Pure breeding

In a cross between Tt × Tt (T = tall, t = short), what is the expected phenotype ratio?

• 1 tall : 3 short

• 3 tall : 1 short

• 2 tall : 2 short

• 4 tall : 0 short

What are alternative forms of a gene called?

• Chromatids

• Alleles

• Mutations

• Nucleotides

What holds sister chromatids together in a chromosome?

• Spindle fiber

• Centriole

• Centromere

• Nucleolus

A mutation in DNA may lead to:

• A change in traits or protein structure

• No effect at all

• New organ development

• Extra ribosomes

How many chromosomes are present in a normal human body cell?

• 23

• 46

• 92

• 22