Topic 3 biology quiz

An eyepiece graticule is how we measure the size of objects using an electron microscope

The scale of an eyepiece graticule is etched onto a [blank_start]glass disc[blank_end] placed in the eyepiece of a microscope. The scale is typically [blank_start]10mm[blank_end] long and divided into [blank_start]100[blank_end] sub-divisions.

What's a good idea to do once you've calibrated the graticule?

What are the features of a nucleus?

The function of the nucleus is to act as the [blank_start]control centre[blank_end] of the cell through the production of [blank_start]mRNA and tRNA[blank_end] hence protein synthesis, retain the [blank_start]genetic material[blank_end] of the cell in the form of DNA and chromosomes and manufacture [blank_start]ribosomal RNA and ribosomes[blank_end].

What are the features of mitochondria?

Mitochondria is the site of [blank_start]aerobic[blank_end] respiration. They're responsible for the production of the energy-carrier molecule, [blank_start]ATP[blank_end], from respiratory substances such as glucose.

What are the main features of chloroplasts?

The chloroplast is adapted to their function of harvesting sunlight and carrying out photosynthesis by the granal membranes providing a [blank_start]large surface area[blank_end] for the attachment of chlorophyll, electron carriers and enzymes that carry out the [blank_start]first[blank_end] stage of photosynthesis, the fluid of the stroma possesses all the [blank_start]enzymes[blank_end] needed to make sugars in the second stage of photosynthesis and chloroplasts contain both DNA and ribosomes to quickly and easily manufacture some [blank_start]proteins[blank_end] needed for photosynthesis.