Introduction

Long-Answer Questions

  1. c: If asked for the energy pathway used in a plant cell, the answer is merely photosynthesis.
  2. c: Consider not just the actual properties of bacteria, but its financial viability as well. Bacteria are quite cheap and are easy to obtain.
  3. d: Not only do bacteria compete for nutrients, they also compete for space (e.g if grown in an agar plate)
  4. a: The hollow cylindrical protein can lead to unwanted substances entering the cell (causing cell lysis) , as well as 'needed' substances escaping the cell - movement that is otherwise blocked by the semi-pemeable cell membrane.
  5. c: While fluid refers to its ability to contract and shift shape, it also refers to the dynamic movement of the proteins themselves (their locations on the cell are not 'static').
  6. a: "The rate of simple diffusion is increasing linearly as the substrate concentration increases." The rate of facilitated diffusion, on the other hand, increases then begins to plateau as the substrate concentration increases.
  7. b: Simple diffusion is unhindered by the requirement of free, unsaturated proteins (which are used by facilitated diffusion), meaning that molecules can travel freely through. However, at a certain point, substrate concentration is enough to saturate facilitated pathways, slowing the transport rate.
  8. c: "Do not require energy" + "Along the concentration gradient"
  9. b: Consider the basic factors (pH, temperature, concentration etc.) and describe them in the context of the problem. For instance, if mentioning pH - talk specifically the pH of which substance needs to be controlled and the effect it may have on the organism/testing environment.
Practical Questions

Generating hypotheses
The SACE board requires hypothesises to be structured to include the effect of the independent variable on the dependent variable, omitting any sort of justification (e.g "because")

Naming Variables
When asked for the independent/dependent variables, aim to be as specific as possible (e.g "rate of Paramecium vacuole concentrations per minute" instead of just "rate of contractions")

Reliability
Reliability <-> random error. Random error is minimised by larger sample sizes, so high sample size correlates to high reliability.

Interactive Graph
Table Of Contents
Introduction
Long-Answer Questions